Four things you can do to increase climb and ceiling capability.
1. Powerflow exhaust as previously mentioned
2. Sensenich prop – more efficient and better climb
3. Climb prop
4. Take Off at a reduced weight
The climb prop will hurt your cruise speed. Everything else will give better climb, ceiling AND cruise.
Remember that best indicated climb speed changes with altitude. It decreases about 1 knot per thousand feet. It’s important to fly the correct speed to get maximum performance.